一种高精度可调阈值产生器

A High-accuracy Adjustable Threshold Generator

基于CSMC 0.25μm BCD工艺,设计了一种高精度的可调阈值产生电路,采用一个7位的DAC和两个5位的DAC结合电阻分压产生8个输出电压,且输出电压可调,精度高。仿真结果表明,对于5位的DAC电路,最大的误差为0.002V,对于基准为1V的电压而言其相对误差只有0.2%,实际测试结果表明电路的最大误差为0.98%。因此,该电路具有面积小、功耗低、精度高的优点。该电路可用于新型射线探测器材料——碲锌镉晶体(CdZnTe,简称CZT)探测器和其他需要可调多阈值电压的应用场合。

Based on CSMC 0.25 tLm BCD process, a kind of high-accuracy adjustable thresh- old generation circuit was designed. Employing a 7-bit DAC and two 5-bit DACs together with a resistor divider, the circuit can produce 8 output voltages that are adjustable with high precision. The simulation results show that the maximum error is 0. 002 V for a 5-bit DAC and 0.2% for a 1 V reference. The experimental results show that the maximum error o{ the circuit is 0.98%. Therefore, the circuit has the advantages of small area, low power consumption and high preci- sion, which can be used in CdZnTe （CZT） detector and other applications needing adjustable multi-thresholds.